Dual Fan Impinging Jet Board Drying Airflow
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Solution Overview
Problem
Existing drying devices for board-shaped materials, particularly gypsum boards, face inefficiencies in air flow distribution due to the limited ceiling unit dimensions, leading to uneven air flow and reduced energy utilization in impinging jet ventilation systems.
Innovation Solution
The use of two fans with a direct drive, arranged next to each other in the ceiling unit, each with a four-pole motor and an outer impeller diameter of approximately 800 mm, separated by a central partition, and optimized to achieve a higher intake height ratio, ensuring even air flow and improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fan is used in the ceiling unit, then the device complexity is reduced, but the air flow distribution becomes uneven due to limited ceiling unit dimensions
Solution Approach 1:
The single fan is segmented into two fans arranged side by side in the ceiling unit. This segmentation allows each fan to cover a specific zone, improving overall air flow distribution uniformity while maintaining a relatively simple device structure.
Solution Approach 2:
The fans are arranged in a lateral dimension (side by side) rather than stacking them vertically. This dimensional arrangement optimizes air flow coverage across the ceiling unit area, achieving more uniform distribution without significantly increasing device complexity.
2Manufacturing precision
If the ceiling unit dimensions are increased to improve air flow distribution, then the air flow evenness is improved, but the device size and installation space requirements increase
Solution Approach 1:
Instead of increasing the overall ceiling unit size, the system segments the air supply function into two smaller fans. This achieves improved air flow distribution uniformity while maintaining compact ceiling unit dimensions suitable for existing installations.
3Use of energy by moving object
If transverse ventilation is used to direct drying air from the side, then the drying speed varies across the width, but the energy consumption is reduced
Solution Approach 1:
The system applies local quality by directing drying air through nozzles at different positions and angles to achieve uniform drying across the board width. Each local zone receives optimized air flow characteristics, ensuring consistent drying speed while maintaining energy efficiency.
4Loss of energy
If longitudinal ventilation is used to stream drying air over the board, then the drying air can be discharged at low temperatures near dew point, but the drying chamber length increases
Solution Approach 1:
The system transitions from longitudinal to transverse/directional air flow through nozzle positioning. This allows the drying chamber to be more compact in length while achieving effective drying by directing air flow perpendicular to the board surface, maintaining energy efficiency through controlled discharge temperature.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the evenness of air flow distribution and increases the efficiency of the drying process, allowing for gentle and energy-efficient drying of board-shaped materials with reduced energy expenditure.
Implementation Method 1
a burner (1) produces drying air
Implementation Method 2
The further conveyance of the air heated by the burner (1) into a pressure chamber (5) occurs via recirculation fans (4a, 4b)
Implementation Method 3
the boards in the drying device are brought into contact with drying air by means of an impinging jet ventilation
Implementation Method 4
The drying of such board-shaped materials preferably occurs by means of a predominately convective heat transfer in the form of heated air flowing over the materials
Implementation Method 5
The boards, which are typically arranged over a plurality of decks, are conveyed through the dryer by means of conveying installations such as roller tracks or filter belts
Data Source
AI summary
In a method for drying boards, which are guided in decks through a drying device, wherein the boards (8) in the drying device are brought into contact with drying air by means of an impinging jet ventilation and wherein the impinging jet ventilation is ensured by means of transversely ventilated nozzle boxes (7), the drying air is supplied by means of at least two fans (4a, 4b) arranged next to one another in an airflow of the drying air produced by a burner (1), which guides the drying air to the fans (4a, 4b).